to advance or not to advance cam???

8)well guys a buddy calle today an ask if i was going to try and race the car this year.i told him yes and went on about diff. stuff to do or try and i already have somrthings in mind but thats a little later on once my shoulder is about right...he ask me if i thought about adv. the cam 4deg. and i said no. he thinks it will make some diff. thought i would run this by you guys and get some ya and na so whats your thoughts on this...
car runs pretty good just looking for some more out of it..runs 7.54 now with a slow 1.67 60' at 89.9 i think it was....

things i plan to up grade some this yr.
8" verta
maybe 4.88 and 29 slick
add water pump drive kit and electric fan (have fan now plan this soon)
try a 750 dlb pumper..

motor now is
340 bored 30
dome tops on h-beams (about 11.5.1)
36 total time with locked dist. autolite 63 i think 35 gap
j-heads mild port /240/140 @500
comp cam x282xs 520/540 with 1.5 rockers/16/18 lash
x-cal intake cleaned up runners with a 950 hp
727 rev. patt. 9.5 dynamic verta 5000
4.57 gears with 27/10.5 qtp
8 gal. cell alum. radi
msd 6al with 7500 chipframe conn.
70 duster

so what would you guys do or try.....would like to get this thing down a few more 10ths this yr....:read2: